in reply to retrieving persistent variables with Data::Dumper followed by the 'do' command
I like Data::Dumper, or more recently Data::Dump, for printing data structures prettily.
For storing and retrieving data, I would use Jason or Yaml or modules with 'storable' or 'freeze' or 'thaw' in their name.
As Occam said: Entia non sunt multiplicanda praeter necessitatem.
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Seekers of Perl Wisdom